Titolo | Does the subtropical jet catalyze the midlatitude atmospheric regimes? |
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Tipo di pubblicazione | Articolo su Rivista peer-reviewed |
Anno di Pubblicazione | 2006 |
Autori | Ruti, P.M., Lucarini V., Dell'Aquila Alessandro, Calmanti Sandro, and Speranza A. |
Rivista | Geophysical Research Letters |
Volume | 33 |
ISSN | 00948276 |
Parole chiave | Atmospheric variability, Climate change, Climatology, Jets, Non-linear orographic theory, Orography, Palnetary waves, planetary wave, Probability density function, Statistical methods, Tropics, troposphere, Weather forecasting |
Abstract | Understanding the atmospheric low-frequency variability is of crucial importance in fields such as climate studies, climate change detection, and extended-range weather forecast. The Northern Hemisphere climate features the planetary waves as a relevant ingredient of the atmospheric variability. Several observations and theoretical arguments seem to support the idea that winter planetary waves indicator obey a non-Gaussian statistics and may present a multimodal probability density function, thus characterizing the low-frequency portion of the climate system. We show that the upper tropospheric jet strength is a critical parameter in determining whether the planetary waves indicator exhibits a uni- or bimodal behavior, and we determine the relevant threshold value of the jet. These results are obtained by considering the data of the NCEP-NCAR and ECMWF reanalyses for the overlapping period. Our results agree with the non-linear orographic theory, which explains the statistical non-normality of the low-frequency variability of the atmosphere and its possible bimodality. Copyright 2006 by the American Geophysical Union. |
Note | cited By 18 |
URL | https://www.scopus.com/inward/record.uri?eid=2-s2.0-33646452298&doi=10.1029%2f2005GL024620&partnerID=40&md5=88e1e6de4bb728b815f64a9285479d23 |
DOI | 10.1029/2005GL024620 |
Citation Key | Ruti2006 |